/* =========================================================
   COVER — Operator's Field Manual
   This layer is intentionally isolated from the legacy game
   section styles in index.html.
   ========================================================= */

:root {
    --cover-paper: #f3f0e8;
    --cover-paper-deep: #e8e3d8;
    --cover-ink: #111210;
    --cover-muted: #65645d;
    --cover-line: #c9c4b8;
    --cover-signal: #e64b2e;
    --cover-signal-soft: #ffd1c7;
    --cover-neon: #b8e84a;
    --cover-neon-soft: rgba(184, 232, 74, 0.24);
    --cover-focus: #0066ff;
}

body {
    color: var(--cover-ink);
    background: var(--cover-paper);
    font-family: 'Manrope', system-ui, sans-serif;
    font-size: 16px;
    line-height: 1.5;
}

body::after {
    display: none;
}

.skip-link {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 10000;
    padding: 11px 15px;
    color: #fff;
    background: var(--cover-ink);
    border: 2px solid #fff;
    font: 600 12px/1.2 'IBM Plex Mono', monospace;
    transform: translateY(-180%);
    transition: transform 160ms ease;
}

.skip-link:focus {
    color: #fff;
    transform: translateY(0);
}

.portfolio-nav {
    position: fixed;
    inset: 0 0 auto;
    z-index: 500;
    height: 76px;
    color: var(--cover-ink);
    background: var(--cover-paper);
    border-bottom: 1px solid rgba(17, 18, 16, 0.18);
    font-family: 'Manrope', system-ui, sans-serif;
    transition: background-color 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

.portfolio-nav.scrolled {
    background: var(--cover-paper);
    border-bottom-color: rgba(17, 18, 16, 0.18);
    box-shadow: 0 10px 30px rgba(17, 18, 16, 0.06);
}

.portfolio-nav .nav-inner {
    width: min(100% - 48px, 1320px);
    height: 100%;
    margin: 0 auto;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.portfolio-nav .nav-logo {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: var(--cover-ink) !important;
    font: 700 14px/1 'Manrope', system-ui, sans-serif;
    letter-spacing: -0.02em;
    text-decoration: none;
    text-shadow: none;
}

.portfolio-nav .nav-logo:hover {
    color: var(--cover-ink) !important;
}

.portfolio-nav .nav-logo:visited,
.portfolio-nav .nav-logo .nav-identity > span {
    color: var(--cover-ink) !important;
}

.nav-monogram {
    position: relative;
    width: 35px;
    height: 35px;
    display: grid;
    place-items: center;
    color: var(--cover-paper);
    background: var(--cover-ink);
    font: 600 11px/1 'IBM Plex Mono', monospace;
    letter-spacing: -0.08em;
}

.nav-monogram::after {
    content: '';
    position: absolute;
    top: -3px;
    right: -3px;
    width: 9px;
    height: 9px;
    background: var(--cover-neon);
    border: 2px solid var(--cover-paper);
}

.nav-identity {
    display: grid;
    gap: 4px;
}

.nav-identity small {
    color: var(--cover-muted);
    font: 500 8px/1 'IBM Plex Mono', monospace;
    letter-spacing: 0.13em;
    text-transform: uppercase;
}

.portfolio-nav .nav-links {
    position: static;
    width: auto;
    height: auto;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
    gap: clamp(18px, 2.2vw, 34px);
    list-style: none;
    background: transparent;
    border: 0;
    box-shadow: none;
    transform: none;
    opacity: 1;
    visibility: visible;
}

.portfolio-nav .nav-links li {
    margin: 0;
}

.portfolio-nav .nav-links a,
.portfolio-nav.scrolled .nav-links a {
    position: relative;
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding: 0;
    color: var(--cover-ink);
    font: 600 12px/1 'Manrope', system-ui, sans-serif;
    letter-spacing: -0.01em;
    text-decoration: none;
    text-transform: none;
}

.portfolio-nav .nav-links a::after {
    content: '';
    position: absolute;
    right: 0;
    bottom: 8px;
    left: 0;
    height: 2px;
    background: var(--nav-accent, var(--cover-signal));
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 180ms ease;
}

.portfolio-nav .nav-links a[data-section="stats"] {
    --nav-accent: var(--manual-pine, #1f6655);
}

.portfolio-nav .nav-links a[data-section="background"] {
    --nav-accent: var(--manual-plum, #704058);
}

.portfolio-nav .nav-links a[data-section="save-point"] {
    --nav-accent: var(--cover-neon);
}

.portfolio-nav .nav-links a:hover,
.portfolio-nav .nav-links a.active,
.portfolio-nav.scrolled .nav-links a:hover,
.portfolio-nav.scrolled .nav-links a.active {
    color: var(--cover-ink);
}

.portfolio-nav .nav-links a:hover::after,
.portfolio-nav .nav-links a.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

.portfolio-nav .nav-links a.active::before {
    content: none;
}

.portfolio-nav .nav-toggle {
    width: 44px;
    height: 44px;
    display: none;
    place-items: center;
    padding: 0;
    color: var(--cover-ink);
    background: transparent;
    border: 1px solid var(--cover-ink);
    box-shadow: none;
}

.portfolio-nav .nav-toggle span {
    position: absolute;
    left: 11px;
    width: 20px;
    height: 2px;
    margin: 0;
    background: var(--cover-ink);
    transition: transform 180ms ease, opacity 180ms ease, top 180ms ease;
}

.portfolio-nav .nav-toggle span:nth-child(1) { top: 13px; }
.portfolio-nav .nav-toggle span:nth-child(2) { top: 20px; }
.portfolio-nav .nav-toggle span:nth-child(3) { top: 27px; }
.portfolio-nav .nav-toggle.open span:nth-child(1) { top: 20px; transform: rotate(45deg); }
.portfolio-nav .nav-toggle.open span:nth-child(2) { opacity: 0; }
.portfolio-nav .nav-toggle.open span:nth-child(3) { top: 20px; transform: rotate(-45deg); }

.cover-hero {
    position: relative;
    z-index: 1;
    min-height: 100svh;
    padding: 96px 0 28px;
    overflow: hidden;
    color: var(--cover-ink);
    background:
        linear-gradient(90deg, transparent calc(50% - 1px), rgba(17, 18, 16, 0.045) 50%, transparent calc(50% + 1px)),
        var(--cover-paper);
    font-family: 'Manrope', system-ui, sans-serif;
}

.cover-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: -2;
    opacity: 0.44;
    background-image:
        linear-gradient(rgba(17, 18, 16, 0.075) 1px, transparent 1px),
        linear-gradient(90deg, rgba(17, 18, 16, 0.075) 1px, transparent 1px);
    background-size: 42px 42px;
    -webkit-mask-image: linear-gradient(90deg, #000, transparent 62%);
    mask-image: linear-gradient(90deg, #000, transparent 62%);
}

.cover-hero::after {
    content: 'MS / 01';
    position: absolute;
    right: -28px;
    bottom: 170px;
    z-index: -1;
    color: transparent;
    -webkit-text-stroke: 1px rgba(17, 18, 16, 0.1);
    font: 800 clamp(110px, 17vw, 260px)/0.8 'Manrope', system-ui, sans-serif;
    letter-spacing: -0.09em;
    white-space: nowrap;
    transform: rotate(-90deg) translateX(100%);
    transform-origin: right bottom;
    pointer-events: none;
}

.cover-shell {
    width: min(100% - 48px, 1320px);
    min-height: calc(100svh - 124px);
    margin: 0 auto;
    display: grid;
    grid-template-rows: minmax(0, 1fr) auto;
    gap: 28px;
}

.cover-stage {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(360px, 0.85fr);
    align-items: center;
    gap: clamp(44px, 7vw, 112px);
}

.cover-copy {
    position: relative;
    z-index: 2;
    max-width: 780px;
    padding: 24px 0;
}

.cover-kicker {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: clamp(22px, 3.5vh, 38px);
    color: var(--cover-muted);
    font: 600 clamp(10px, 0.88vw, 12px)/1.4 'IBM Plex Mono', monospace;
    letter-spacing: 0.09em;
    text-transform: uppercase;
}

.cover-kicker::before {
    content: '';
    width: 10px;
    height: 10px;
    flex: 0 0 auto;
    background: var(--cover-neon);
    border-radius: 50%;
    box-shadow: 0 0 0 5px var(--cover-neon-soft);
}

.cover-title {
    margin: 0;
    color: var(--cover-ink);
    font: 800 clamp(78px, 9.2vw, 142px)/0.76 'Manrope', system-ui, sans-serif;
    letter-spacing: -0.085em;
    text-transform: uppercase;
}

.cover-title span {
    display: block;
}

.cover-title span:last-child {
    position: relative;
    margin-left: clamp(36px, 7vw, 108px);
    color: transparent;
    -webkit-text-stroke: 2px var(--cover-ink);
}

.cover-thesis {
    max-width: 720px;
    margin: clamp(28px, 4vh, 46px) 0 14px;
    color: var(--cover-ink);
    font: 600 clamp(24px, 2.25vw, 36px)/1.15 'Manrope', system-ui, sans-serif;
    letter-spacing: -0.04em;
}

.cover-dek {
    max-width: 670px;
    margin: 0;
    color: var(--cover-muted);
    font: 500 clamp(15px, 1.15vw, 18px)/1.65 'Manrope', system-ui, sans-serif;
    letter-spacing: -0.015em;
}

.cover-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    margin-top: clamp(26px, 4vh, 40px);
}

.cover-button {
    min-height: 52px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    padding: 0 20px;
    color: var(--cover-paper);
    background: var(--cover-ink);
    border: 1px solid var(--cover-ink);
    box-shadow: 4px 4px 0 var(--cover-neon);
    font: 700 13px/1 'Manrope', system-ui, sans-serif;
    text-decoration: none;
    transition: color 180ms ease, background-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.cover-button span {
    font-family: 'IBM Plex Mono', monospace;
    transition: transform 180ms ease;
}

.cover-button:hover {
    color: var(--cover-ink);
    background: var(--cover-neon);
    box-shadow: 0 0 0 var(--cover-neon);
    transform: translateY(-2px);
}

.cover-button:hover span {
    transform: translateX(4px);
}

.cover-socials {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
    margin: 22px 0 0;
    padding: 0;
    list-style: none;
}

.cover-socials a {
    position: relative;
    min-height: 36px;
    display: inline-flex;
    align-items: center;
    color: var(--cover-muted);
    font: 600 11px/1 'IBM Plex Mono', monospace;
    text-decoration: underline;
    text-decoration-color: rgba(101, 100, 93, 0.45);
    text-underline-offset: 5px;
    transition: color 160ms ease, text-decoration-color 160ms ease;
}

.cover-socials a:hover {
    color: var(--cover-signal);
    text-decoration-color: var(--cover-signal);
}

.cover-portrait-wrap {
    position: relative;
    min-height: clamp(510px, 64vh, 650px);
    align-self: stretch;
}

.cover-portrait-wrap::before {
    content: '';
    position: absolute;
    top: 7%;
    right: -4%;
    bottom: 4%;
    left: 13%;
    background: var(--cover-signal);
}

.cover-portrait {
    position: absolute;
    inset: 0 6% 5% 0;
    margin: 0;
    overflow: hidden;
    background: #c9d0cf;
    border: 1px solid var(--cover-ink);
    box-shadow: 18px 18px 0 rgba(17, 18, 16, 0.13);
}

.cover-portrait img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    object-position: 68% 48%;
    filter: grayscale(100%) contrast(1.06) saturate(0.25);
    image-rendering: auto;
    transform: scale(1.015);
    transition: filter 420ms ease, transform 700ms cubic-bezier(0.2, 0.75, 0.2, 1);
}

.cover-portrait::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 54%, rgba(10, 12, 10, 0.65));
    pointer-events: none;
}

.cover-portrait-wrap:hover .cover-portrait img {
    filter: grayscale(55%) contrast(1.04) saturate(0.55);
    transform: scale(1.04);
}

.cover-portrait figcaption {
    position: absolute;
    right: 22px;
    bottom: 18px;
    left: 22px;
    z-index: 2;
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px;
    color: #fff;
    font: 500 10px/1.5 'IBM Plex Mono', monospace;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.cover-portrait figcaption strong {
    max-width: 210px;
    color: #fff;
    font-weight: 500;
    text-align: right;
}

.cover-tag {
    position: absolute;
    z-index: 3;
    padding: 12px 14px;
    color: var(--cover-paper);
    background: var(--cover-ink);
    border: 1px solid var(--cover-paper);
    box-shadow: 7px 7px 0 var(--cover-signal);
    font: 600 9px/1.45 'IBM Plex Mono', monospace;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.cover-tag-current {
    top: 12%;
    left: -30px;
    box-shadow: 7px 7px 0 var(--cover-neon);
}

.cover-tag-index {
    right: -2px;
    bottom: 1%;
    color: var(--cover-ink);
    background: var(--cover-paper);
    border-color: var(--cover-ink);
    box-shadow: 7px 7px 0 var(--cover-ink);
}

.cover-trace {
    position: relative;
    min-height: 106px;
    display: grid;
    grid-template-columns: minmax(150px, 0.75fr) minmax(0, 4fr) minmax(180px, 1fr);
    align-items: stretch;
    color: var(--cover-paper);
    background: var(--cover-ink);
    border: 1px solid var(--cover-ink);
}

.trace-heading,
.trace-proof {
    padding: 18px 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 10px;
}

.trace-heading {
    border-right: 1px solid rgba(243, 240, 232, 0.23);
}

.trace-heading span,
.trace-proof span {
    color: rgba(243, 240, 232, 0.58);
    font: 500 8px/1.3 'IBM Plex Mono', monospace;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.trace-heading strong,
.trace-proof strong {
    color: var(--cover-paper);
    font: 600 11px/1.4 'IBM Plex Mono', monospace;
}

.trace-flow {
    min-width: 0;
    display: grid;
    grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
    align-items: center;
    gap: clamp(8px, 1.2vw, 18px);
    padding: 16px clamp(18px, 2.5vw, 34px);
}

.trace-node {
    min-width: 0;
    display: grid;
    gap: 6px;
}

.trace-node b {
    color: var(--cover-signal);
    font: 600 8px/1 'IBM Plex Mono', monospace;
}

.trace-node strong {
    overflow: hidden;
    color: var(--cover-paper);
    font: 600 clamp(11px, 1vw, 14px)/1 'IBM Plex Mono', monospace;
    text-overflow: ellipsis;
}

.trace-node small {
    color: rgba(243, 240, 232, 0.48);
    font: 400 8px/1.2 'IBM Plex Mono', monospace;
}

.trace-arrow {
    color: var(--cover-signal);
    font: 400 18px/1 'IBM Plex Mono', monospace;
}

.trace-proof {
    border-left: 1px solid rgba(243, 240, 232, 0.23);
}

.trace-proof strong {
    color: var(--cover-neon);
}

.cover-hero a:focus-visible,
.portfolio-nav a:focus-visible,
.portfolio-nav button:focus-visible {
    outline: 3px solid var(--cover-focus);
    outline-offset: 4px;
}

@media (max-width: 1080px) {
    .cover-stage {
        grid-template-columns: minmax(0, 1.18fr) minmax(310px, 0.82fr);
        gap: 44px;
    }

    .cover-title {
        font-size: clamp(70px, 9.5vw, 104px);
    }

    .cover-portrait-wrap {
        min-height: 530px;
    }

    .cover-trace {
        grid-template-columns: 130px minmax(0, 1fr);
    }

    .trace-proof {
        display: none;
    }
}

@media (max-width: 820px) {
    .portfolio-nav {
        height: 68px;
    }

    .portfolio-nav .nav-inner,
    .cover-shell {
        width: min(100% - 36px, 680px);
    }

    .portfolio-nav .nav-toggle {
        position: relative;
        z-index: 3;
        display: grid;
        flex: 0 0 auto;
    }

    .portfolio-nav .nav-links {
        position: fixed;
        inset: 0;
        z-index: 2;
        width: 100%;
        height: 100dvh;
        padding: 96px 28px 34px;
        display: flex;
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        gap: 2px;
        overflow-y: auto;
        color: var(--cover-paper);
        background: var(--cover-ink);
        transform: translateY(-105%);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: transform 260ms cubic-bezier(0.25, 0.8, 0.25, 1), opacity 180ms ease, visibility 0s linear 260ms;
    }

    .portfolio-nav .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transition-delay: 0s;
    }

    .portfolio-nav .nav-links a,
    .portfolio-nav.scrolled .nav-links a {
        min-height: 64px;
        color: var(--cover-paper);
        border-bottom: 1px solid rgba(243, 240, 232, 0.18);
        font-size: clamp(22px, 6vw, 34px);
        font-weight: 500;
    }

    .portfolio-nav .nav-links a:hover,
    .portfolio-nav .nav-links a.active,
    .portfolio-nav.scrolled .nav-links a:hover,
    .portfolio-nav.scrolled .nav-links a.active {
        color: var(--cover-signal-soft);
    }

    .portfolio-nav .nav-links a::after {
        content: none;
    }

    .portfolio-nav .nav-toggle.open {
        color: var(--cover-paper);
        border-color: var(--cover-paper);
    }

    .portfolio-nav .nav-toggle.open span {
        background: var(--cover-paper);
    }

    .cover-hero {
        padding-top: 94px;
    }

    .cover-shell {
        min-height: auto;
    }

    .cover-stage {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .cover-copy {
        max-width: 680px;
        padding-top: 10px;
    }

    .cover-title {
        max-width: 660px;
        font-size: clamp(70px, 15vw, 112px);
    }

    .cover-thesis {
        max-width: 620px;
    }

    .cover-portrait-wrap {
        width: min(92%, 560px);
        min-height: 570px;
        margin-left: auto;
    }

    .cover-trace {
        margin-top: 12px;
    }
}

@media (max-width: 560px) {
    .portfolio-nav .nav-inner,
    .cover-shell {
        width: calc(100% - 30px);
    }

    .nav-identity small {
        display: none;
    }

    .cover-hero {
        padding: 86px 0 18px;
        background: var(--cover-paper);
    }

    .cover-hero::before {
        opacity: 0.3;
        background-size: 32px 32px;
    }

    .cover-hero::after {
        display: none;
    }

    .cover-kicker {
        align-items: flex-start;
        margin-bottom: 26px;
        font-size: 9px;
        line-height: 1.7;
    }

    .cover-kicker::before {
        margin-top: 3px;
    }

    .cover-title {
        font-size: clamp(56px, 20.5vw, 86px);
        line-height: 0.82;
        letter-spacing: -0.075em;
    }

    .cover-title span:last-child {
        margin-left: clamp(18px, 7vw, 34px);
        -webkit-text-stroke-width: 1.5px;
    }

    .cover-thesis {
        margin-top: 32px;
        font-size: clamp(24px, 7.5vw, 32px);
    }

    .cover-dek {
        font-size: 16px;
        line-height: 1.6;
    }

    .cover-actions {
        align-items: stretch;
    }

    .cover-button {
        width: 100%;
        min-height: 54px;
    }

    .cover-socials {
        justify-content: space-between;
        gap: 6px 12px;
    }

    .cover-socials a {
        font-size: 10px;
    }

    .cover-portrait-wrap {
        width: calc(100% - 12px);
        min-height: 455px;
        margin: 0 0 8px 12px;
    }

    .cover-portrait-wrap::before {
        top: 5%;
        right: -12px;
        left: 10%;
    }

    .cover-portrait {
        inset: 0 0 4% 0;
        box-shadow: 10px 10px 0 rgba(17, 18, 16, 0.15);
    }

    .cover-tag-current {
        top: 22px;
        left: -12px;
    }

    .cover-tag-index {
        right: -5px;
        bottom: -1px;
    }

    .cover-portrait figcaption {
        right: 14px;
        bottom: 14px;
        left: 14px;
        font-size: 8px;
    }

    .cover-trace {
        min-height: 0;
        grid-template-columns: 1fr;
    }

    .trace-heading {
        min-height: 62px;
        flex-direction: row;
        align-items: center;
        border-right: 0;
        border-bottom: 1px solid rgba(243, 240, 232, 0.23);
    }

    .trace-heading span,
    .trace-heading strong {
        max-width: 50%;
    }

    .trace-flow {
        grid-template-columns: 1fr 1fr;
        gap: 0;
        padding: 0;
    }

    .trace-node {
        min-height: 84px;
        padding: 15px 17px;
        border-right: 1px solid rgba(243, 240, 232, 0.2);
        border-bottom: 1px solid rgba(243, 240, 232, 0.2);
    }

    .trace-node:nth-of-type(even) {
        border-right: 0;
    }

    .trace-arrow {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}